One google voice but several ways to configure it. Go to the google voice website and create a gv account. Note, I do not configure it for Sprint integration. Download the google voice app from the play store to your nexus 5. Setup google voice from the website to call your phone(s) for incoming calls. Setup the app on the phone to us google voice for outgoing calls. Works for all carriers.
Jim, Sent from my Photon 4G using Tapatalk 2